Abstract
FePt nanoparticles have been successfully synthesized by the alternate reduction of chloroplatinic acid and ferric chloride, in the presence of acetyl trimethyl ammonium bromide as a surfactant in aqueous medium. Detailed investigations on the structural and magnetic properties of these nanoparticles were presented as a function of annealing temperature. Selected area electron diffraction shows the initiation of phase transition from the as-synthsized phase to ordered face center tetragonal (FCT) at 400°C. The x-ray diffraction and magnetic measurements confirm the transformation to FCT phase at 400°C. The magnetic measurements at room temperature show a double phase hysteresis loop at 400°C and a nearly single phase hysteresis loop at 600°C, with the coercivity of about 3.4kOe and 16.2kOe, respectively. We report for the first time this alternate reduction method in synthesizing FePt nanoparticles, obtained a decrease of about 100°C in the ordering temperature.
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